let me tell you some world-class brands: 1. Swiss FM AcoustiCS, Ensemble, Piega, Revox, Orpheus, Nagra, Weiss, etc., 2. American Wilson Audio, 3. Danish Gryphon, 4. German MBL, and the super-expensive grand enigma of kharma in the Netherlands. There are still many domestic players such as German morning glory and German physics Gaudi, Gawain, Guifeng, Weixin, MBL, Weiss, Maijingtu and Golden Voice, but the more common players are Danna, Baohua, Tianlang, JBL, Chu Qing after the rain, atc and so on.